Motor-controller.



C. T. EVANS.

MOTOR CONTROLLER.

V APPLICATION FILED SEPT.9,1912, RENEWBD NOV. 15,1913. 1,'100g96@ Patented June 23, 31914L 2 SHEETS-SHBBT l.

'0. T. EVANS.

MOTOR UONTROLLER.

APPLICATION PLLED SEPT. 9, 1912. RBNEWBD Nov. 15, 1913.

1,100,964L, Patented, June 23,1914

l l l l '1,100,964.- Application filed September 9, 1912, Serial No. 719,305. Renewed November 15, 1913. Serial No. 801,257.

' sancties PATENT onirica CLARENCE T. EVANS, F- MILWAUKEE, WISCONSIN, ASSIGNOR T0 THE 'CUTILER- .HAMMER MFG. C0., ,OF`MILWAUKEE, WISCONSIN, A CORPORATION 0F WISCONSIN.

Moron-CONTROLLER.

To all cli/1.07m it may/ concern Be 1t 'known that I, CLARENCE T. EVANS,

i acitizen ofthe United States, residing at Milwaukee, in the county of Milwaukee and State of, Wisconsin, have invented. new and useful Improvements in Motor-Controllers,

, of which the following is a full, clear, conoise7 and exact description, reference heilig 'had to the accompanying drawing, forming a part of this specification.. V A

-My'inyention relates to improvements in starting devices for 'electric motors.

More particularly it relates to lcompound starters, although certain features thereof may be applicable'to other forms of controlling devices.

Compound starters4 are those adapted to both start and regulate the speed of a motor. In such devices it is important to insure ther inclusion-'of the starting resistance and the exclusion of the regulating resistance prior to the closure of the motor circuit. .In

' Y vorder to'attain ,this result it has heretofore been proposed to provide a construction whereby thev starting resistance. 1s reinserted in circuit and the regulating resistance exeluded. from circuit as the motor is stopped,l thereby insuring the proper conditions for restarting. In practice,however, it has been foundthat the exclusion of the regulating resistance. as the motor is vstopped is -objectionable.

-My invention has amongits objectsto' pro-vide astarting device which will insure the'inclusion of the starting resist-anci and the exclusion of the regulating resistance at the time of starting the motor but which will not exclude or'vary the regulating re.-` sistance until after the' motor has been stopped. M v invention has various other objects and advantages which will be hereinafter For the purpose of fully and clearly disclosingr the nature and advantages of my inl vention I shall describe the embodiment thereof illustrated in the accompanying drawing, it being understood that my inven-v tion is susceptible of modification.

In the drawing, Figure 1 is a front elevation' of the device with the mclos'ing casin'g shown. in section. Fig.`2 is a side elev'a- Specification of Letters Patent.

` starting conditions,

Patented June 23, 1914 .willbe later more fully explained-the armature arm is biased to initial position While the field arm and starting arm are biased to' move into a predetermined relation and the loperating` arm has an `independent move.

mentof both the armature and field arms.

'The' construction is such that when the operatingarm is moved in a direction to start the motorit moves the field arm to position to exclude all field resistance prior to mov-, ing the armature arm to remove the arma ture resistance. This insures the desired After these conditions yhave been established the operatingr arm is then movable farther in the same direction to operate the armature arm to remove the armature resistance and start the' motor. When all of tlfe armature resistance is removed from circuit the armature arm is held by a retaining magnet and theoperating arm is then` movable in an opposite direction to move the field arm to insert field're sistauce to speed up .the motor. When the armature arm is released by the retaining magnet the same returns to initial position thereby reinsertiug the. armature. resistance and stopping the motor while the field arm remains stationary until further operation of the operating arm. made iu the field strength of the motor during the stoppingperiod.

The various parts of the controller arescrews 7 or any other suitable means. The

panel 4A is secured against shoulders 8 with# in the iuclosing casing by means of screws 9.

The arms l and 2 are fulcrumed on a' stud 10 projecting forwardly from the lower end of the base 4 and suitably secured tothe base as by. means of a threaded shank 11 Thus no change is and lnutn12.A Both arms are freely rotatable on this stiid. The arm 1 has a hub 13 bearing against a bearing plate le provided on the front side of the base 4. Surrounding the hub 13 of the arm 1 and connected thereto at one end is a coil spring 15 having its opposite end bearing against a pin 16 projecting from the base 4 through the bearing plate 14. The spring 15 biases thearm 1 to the left or yin an anti-clockwise direction. The army A2 has a hub 17 hearing against the outer face of the arm 1 while on the opposite side of the arm 2 and revolubly mounted upon the stud 10 is the pawl 18.

The pawl 1B has two rearwardly extending .lugs 19 and 2O arranged approx-:imately 90 Adegrees apart. As best illustrated in Figs. 1 and 4i, the lug 20 is of sufiicient length to engage the left hand side of the armature arm 1. The lug 19 isshorter and engages only the field arm 2. The field arm 2 has an extension 21 on the right hand side of the lug-19 to beengagedj thereby.. .A spring 22 coiled about the hub of the arm 2 has one end securedr4 to said hub and its opposite end bearing against the left hand side of the lug 19. This spring yieldingly holds the arm 2 and pawl 18 in. such a relation as to cause the lug 19 to engage the extension 21 of the arm 2. The'pawl 18 is provided on its front side with diametrically disposed lugs 24 projecting into notches in an insulating disk 25. The operating arm 8 is fixed to the outer end of a stud 27 revolubly mounted in a bearing 28' for rigidly connecting the operating arm 3 and the pawl 18. Vifvith this arrangement it will be observed that if 'the operating arm 3 is moved to the left it will operate the pawl in a counter-cloclnvisedirection, and by engagement of the lug 19 with the lug 21 of the held arm 2 will alsomove said Held arm in the same direction. It will ifurther be observed that this operation does not l aii'ect the spring 17 nor the armature arm 1. On theV other hand, it the operating arm be moved to the right the pawl will be moved in clockwise direction and by engagement of the lug 19 thereof with the end of the spring 17 will tension said spring. The spring 17 allows the operating arm to be moved in the same direction independently of the lield arm 2 but during said movement stores up energy for returning the arm 3 as soon as released to the normal relation with the arm 2. Further, theoperation of the arm 3 to the right hand and consequent clockwise movement of the pawl throws the lug 20 of the pawl into engagement with the armature arm 1, imparting a clockwise movement thereto against the action of the spring 15. The lug 20 on the pawl is preferably so disposed as to permit operation of the eld arm from its extreme lett hand position to its extreme right hand position before said lug engages said arm 1 and the operating arm 3 is preferably .so

disposed as to assume a vertical position' ment 33 also mounted' upon` the panel 4..

Secured to the panel 4 on the left hand side thereof is a stop 8st for limiting the movement of the arm 1 under the influence of the spring The arm 1 when against this sto disen aces its brushes from' the con-` tacts 32 and segment Secured to the panel 4. on the opposite side thereof is a retaining magnet. 35 for holding the armature arm 1 against the action ot' the spring 15 in its extreme right hand position. The lield arm 2 carries a contact pencil 36 movable over a series of contact buttons 37 arranged in an are on the panel 4 and concentrically with the contacts 32.

All of the foregoing parts are mounted in trontof the panel 4;, thus leaving a compartment at the rear of the panel for the resistance units. In practice these units may be of any preferred type and mountedl within the casing in any prferred manner. I prefer, however, to employ elongated flat units and to mount the same on the rear ofA panel. This switch arm is adapted to engage a contact stud 115 also projecting forwardly from the panel 4. The switch arm L13 is biased into engagement with the contact stud 45 by a spring 4G coiled about the stud 111. A push button 47 extending through the top of the casing and engaging an extension 4:8 of the switch arm 43 provides meanswhereby said switch arm vmay be disengaged from the contact 45. This switch, as will later be st forth, is provided lfor denergizing'the retaining magnet 35.

. The front of the casing is preferably provided with meansas shown 1n Fig. 3 to inmodena cally illustrated as connected to the contact buttons 32 and a field resistance R as connectedtothe contact buttons 3.7. rlhe armature arma-nd the field arm are shown in their eXtreme left hand 'positions in which the former interrupts the motor circuit aid' n this position vof the arms 1 and 2 the operat-o ing a-rm.3 would standin the position Ashown in dottedlines, Fig. 3. Assume now that the arm.3 is. moved to the right. It moves the field. arm 2 in a. corresponding direction A.through the medium of the pawl 18 and spring 22.1'until thearm 2 reaches its extreme right handposition. When this'position is reached the operatingarm 3 will have attained the full line position shown in Fig. 3 and .the lugr` 20 of the pwl 18- will have been brought into Contact with the arm 1. Continued movement. of the arm 3 to the right Willaccordingiy move the armature armV to the-right, first closing the armature circuitand then cutting out the armature resist-ance. The'motor circuit. is closed as soon as the armature arm engages the Contact buttons y32:.aud segment 33. It may be'traced as follow-s: from the positive side of the supply circuit by conductor50 to segment 33 to and 'through brushes. 30 to contacts 32 through all of they resistance R by conductor 51 through the motor armature A byconductor 52;:.tothe negative side/of the supply circuit. Thefield circuit may be traced from the.ar m '1 to the. arm 2 thence through the contact 36 thereof to the extreme rightl hand contact 37 by conductor 53 through th field winding F to conductor 52.v It-will thus be observed ythat when the motor circuit .is'closed all ofl the armature resistance is included while all of the field-resistance is excluded`or shortcircuited. Gontinuedinovement of the operating arm 3 and the armature arm 1 will gradually cut out the resistance E until all ofthe same is excluded from circuit. vWhen .thearmature arm reaches final position it is gripped by the magnet 35. The circiiit of .nngnet 35 may be traced from the extreme hand Contact 32 by conductors 511 through p'ush button switch 4.3 by conductors 55 through aprotective resistance r by conuctor -56 through said magnet by conductor fftonconductor 52. Themagnet 35 being thusicormeeted" irneirouit holds-.the armature arm against returnmovement until denergized by failure of voltage or by the opening of theswitch a3. During the movement of the operating arm past the full line posi.- tion, shown in. Fig. 3, the spring 22 connecting the same to the field armis placed under tension. Accordingly if after the-armature arm 1 has been moved to final position the arm 3 isv released it will automatically return to the full line position, shown in Fig; ln this position it will bring the lug` 19 of the paivl 18 intoengagement with the lug 21 ou the field arm 2 whereby continued movement of the'arm 3 to the left Will cause tion. Movement of the field arm in this di rection inserts tl1e..resistance R in circuit with the field winding F of the motor, thereby weakening' the field strength and increasing the speed of' the motor. The field arm may be moved back and forth over the contacts 37 to vary the field strength at will and may be left in any desired position. Assume ergized, the spring 15 will at once return the armature a-rm to initial position, thereby gradually reinserting the armature resistance R and finally openingr the motor circuit.' This operation, however, will have' no' effect upon the field arm or operatingarm. Both will remain in the position in which they were left. Accordingly, the field strength .of the motor will not be varied du'ring the period of stopping. `When, however, the armature arm reaches off position, thereby disengaging segment 33, it disconnects the field arm from circuit and thus opens the circuit or" the field winding. To restart the motor it is only necessary to'repeat the op; eration heretofore described, that is, first moving the arm 3 to the right to start, and then to the left for field regulation. It makes no di'li'erencein what positions the fiel@ arm and operating arm were left during the preceding operation.- Movement of. the operating arm in one direction will always restore the field arm to initial position and restart the motor. No backward 'move'- -ment whatever isI necessary in order to restore the arms to the proper positions.

What i claim as new and desire to secure by-Letters Patent, is:

l. ln a motor controller, in combination; a movable member, a: second movable member, said first member being biased to return to initial position independently of said second member, and a. third movable member for operating said first two mentioned members and insuring the' return of said second member to initial position prior to movenient of said first member'away from initial position.

` 2. ln a motor-controller, in combination, af movable-'member, -a= second movable linemthe field arm to be moved in the'same direcnow that the retaining magnet 35 is den second member, and a third member movable in a single direction to first return said second member -toinitial position. and therel after move said first member away from initial position.

3. In a motor controller, in combination,

to initial position independently of said sec-Y ond member, and a third movable membermovable in one direction to first restore said second member to initial position yand thereafter move said first member away from initial position and movable in a reverse direction to move saidA second member away from initial position independently of said first member. i 4.l In a motor controller, in combination, a movable member, a second movable member, said members being movable back and forth between substantially the same limits, said -first member being movable toward initial position independently of said second member, and a common operating member for said first two members insuring the return of said second member to initial position prior to movement of said first member Laway from initial position.

5. In a motor controller, in combination,

a movable member, a second movable member, said members being`movable in opposite directions from their respective initial positions and said first member being movable' to its initial position independently of said second member, and a common operating member for said first two members insuring the return of said second member to its initial position prior` to movement of said first member away from its initial position.

6. In a motor controller, in combination, almovable member, a second movable member, said members being movable in oppop site directions from their respective initial positions, and said first member being returnable .to its initial position independently of said second member, and a common operating member for said first two members movable in a single direction to first restore said second member to its initial position and thereafter move said first member away from its initial position.

7. In a motor controller, in combination, a movable member, a second movable member, said members being movable in opposite directions from their respective initial positions and said first member being biased to move to initial position independently of .said second member, a retaining magnet for holding said first member in a predetermined position, and ay common operating member for said first two members'movable in a single direction to first restore said second member to its initial position and thereafter move said firstimember into position to be held by said retaining magnet.

8. In a motor controller, in combination, a movable member, a second movable member, said members being movable in opposite directions from their respective initial positions and said first member being biased.

to move to initial position independently of saidlrsecond member, a retaining magnet for holding said first member in a 1 predetermined position, and a common operating member for said first two members movable in va single direction to' first restore said second member t its initial position and there after move said first member into position to be held by said retaining magnet, said operating member thereupon being movable in a reverse direction to move said second member away from its initial position.

9. In a motor controller, in combination,

la starting member, a speed regulating member, said starting member being adapted to automatically return to initial position independently of said speed regulating member, and a singlel operating member movable in one direction to first return said speed regulating arm to initial,A position' andl then move said starting member to running position.

regulating Imember independently of said` starting member.

ll. In a motor'controller, in combination, a starting member, a speed regulating member, anda common operating member therefor movable in a single direction to first restore said speed regulating member to initial position and then move Said starting member toward running position, and movable in a reverse direction to move said speed regulating member independently of "said starting member, said speed regulating member remaining stationary upon the return of said starting member to initial'position. v

12. In a motor controller, in combination, a starting member, aspeedregulating member, said members being movable in opposite directions from their respective initial positions, and a single operating member for said first two members insuring the return of said speed regulating member to initial position prior to starting the motor. 13. In a motor controller, in combination, y a starting member; a.' speed -regulatingmernL y 10. In a motor controller, in-coinbination,

bersaid members being movable in opposite directions from their respective initial positions, and a single operating member for said first two members insuring the return of said speed regulating member to initial position prior to starting the motor, said speed regulating member remaining stationary upon the return movement of said starting member to initial position.

1li. In a motor controller, in combination, a starting member, and a speed regulating member, said members being movable between substantially7 the same limits, and said speed regulating member remaining stationary upon movement of said starting member to off position, and a common operating means for said members insuring the return of said speed regulating member to initial position prior to starting the motor.

15. In a motor controller, in combination,

' an armature resistance a controlling member therefor, a field re itance, a controlling member therefor, said iield resistance member being adapted to'remain stationary upon movement of said armature resistance member to reinsert resistance, and an operating member for saidarmature resistance member adapted when moved in a direction to cut out armature resistance to return said' eld resistance member to initial position prior to the removal of any of said armature resistance.

16. In a motor controller, in combination, an armature resistance, a controlling member therefor, a field resistance, a controlling member therefor, said field resistance member remaining stationary upon movement of said armature resistance member toward initial position, and a single operating member movable in a single direction to first return said field resistance member to initial position and then move said armature resistance member to cut out said armature resistance, said operating member being movable in a reverse direction to move said field resistance member independently of said armature resistance member to insert said field resistance.

17. In controller for electric motors, in combination, an armature resistance, a controllingmember therefor, a field resistance, a controlling member therefor, said members being movable in the same direction to remove their respective resistance, and operating means for said members insuring the removal of all of said field resistance prior to the removal of any of said armature resistance, said field resistance member remaining stationary upon movement of said armature resistance member to reinsert said armature resistance.

18. In a motor controller, in combination, an armature resistance, a controlling member. therefor, a field resistance, a controlling member therefor, said members being effective to control their respective resistances Within common limits of movement and said field resistance member remaining stationary upon movement of said armature resistance member to reinsert said armature resistance, and a single operating device for both of said members insuring the removal of all of said field resistance prior to removal of any of said armature resistance.

19. In a ino-tor controller, in combination, two independently movable controlling members, one of said members being biased in one direction, and a third member operatively connected to said 'former members and adapted when moved in one direction to move said controlling members successively in the same direction to predetermined positions, moving said biased member after said other member, said operating member when moved in a reverse direction moving said latter controlling` member independently of said biased member.

20. In a motor controller, in combination, two independently movable controlling members, one of the same being biased in one direction, and an operating member having a predetermined degree of movement independently of said biased member and having a resilient connection with said other controlling member whereby movement of said operating member m one direction moves said controlling members successively in the l same direction to predetermined positions, the biased member being moved last, and said operating member after moving said biased member being movable in an opposite direction to move said other controlling member in the opposite direction independently of said biased member.

21.. In a motorcontroller, in combination, two independently movable controlling members, one adapted to control an armature resistance and the other a field resistance, means biasing said armature resistance member toward initial position, said field member being unbiased and adapted to remain in any one of a number of different positions, and an operating member having a resilient connection with said field resist ance member, and a part adapted to engage said armature resistance member whereby said operating member when moved in one direction will successively move said field resistance member and said armature re sistance member to first remove the field resistance and then the armature resistance, said operating member then being movable in the opposite direction to move said field resistance member to insert field resistance. 22. The combination with a motor having a shunt field winding of an armature resistance, a controlling member therefor, a

ture resistance from circuit, said armature member being movable to reinsert said armature reslstance Wlthout movement of said field member and upon reachmg lnltml position to disconnect the motor eld winding L0 from circuit.

In Witness whereof, I have hereunto Subscribed my name in the presence of two witnesses.

' CLARENCE T. EVANS. Witnesses f' FRANK H HUBBA-nn, JEANETTE S. BROCK. 

